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An assessment of the influence of recruitment from the sediment on the development of planktonic populations of cyanobacteria in a temperate mesotrophic lake.

Head, R. M. and Jones, Roger I. and Bailey-Watts, A. E. (1999) An assessment of the influence of recruitment from the sediment on the development of planktonic populations of cyanobacteria in a temperate mesotrophic lake. Freshwater Biology, 41 (4). pp. 759-769. ISSN 0046-5070

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Abstract

1. A number of planktonic cyanobacteria species form resting stages that survive in the sediments of lakes. The significance of this life history strategy to the ecology of new planktonic populations was investigated in Esthwaite Water, a mesotrophic lake in the English Lake District. 2. A simple trapping technique was used to quantify vertical movements of five species of buoyant gas-vacuolate cyanobacteria from close to the sediments, along a depth transect. 3. 'Recruitment' from the sediments was found to be widespread amongst the cyanobacteria species associated with the summer phytoplankton community. 4. Estimates of the vertical upward fluxes of cyanobacteria based upon trap catches could not account for observed increases in the planktonic populations suggesting that 'recruitment' was not a significant source of biomass. 5. Vertical upward movements of Anabaena solitaria were recorded prior to this species becoming established in the plankton suggesting that benthic populations might be a source of cells for initial pelagic growth of populations of this species. 6. Low numbers of vegetative filaments of Anabaena flos-aquae, Aphanizomenon flos-aquae and Oscillatoria agardhii were observed in the plankton through the winter. These small overwintering populations appeared to be the primary source of inocula for the large summer populations of these species.

Item Type: Article
Journal or Publication Title: Freshwater Biology
Uncontrolled Keywords: akinetes • blue-green algae • cyanobacteria • migration • recruitment • resting stages • vertical movement • trapping
Subjects: Q Science > QH Natural history > QH301 Biology
Departments: Faculty of Science and Technology > School of Computing & Communications
ID Code: 10940
Deposited By: Mr Richard Ingham
Deposited On: 28 Jul 2008 13:19
Refereed?: Yes
Published?: Published
Last Modified: 18 Sep 2013 16:01
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/10940

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